This is an opportunity to work at the frontier of AI for science and the Department of Energy Genesis mission, where large-scale machine learning, scientific data, simulation, and leadership-class supercomputers come together to enable new modes of discovery across physics, materials science, chemistry, biology, climate, energy, and related fields. The successful candidate will conduct research on methods that improve the usefulness, reliability, and scientific performance of large-scale AI models after pretraining, while also advancing the systems and software needed to run these methods efficiently on cutting-edge supercomputers and emerging AI platforms.